Sheet-delivery apparatus for printing-presses



2 Sheets-Sheet 1.

(No Model.)

J. T. HAWKINS.

SHEET DELIVERY APPARATUS FOR PRINTING PRESSES. No. 323.330. Patented July 28, 1885.

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(No Model.) 2 Sheets-Sheet 2. J. T. HAWKINS.

SHEET DELIVERY APPARATUS FOR PRINTING PRESSES.

Patented July 28, 1885.

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JOHN T. HAWKINS, or TAUNTON, MASSACHUSETTS.

SHEET-DELIVERY APPARATUS FOR PRINTING-PRESSES.

SPECIFICATION forming part of Letters Patent No. 323,330, dated July 28,1885.

Application filed December .27, 1894. (No model.)

To all whom it may concern:

Be it known that 1, JOHN T. HAWKINS, of Tannton, in the county of Bristol and State of Massachusetts, have invented a certain new and useful Improvement in SheetDelivery Apparatus for Printing- Presses, which improvement or invention is fully set forth and illustrated in the following specification and accompanying drawings.

The object of this invention is to provide a cheap, quick, and easy means of keeping the tail of the sheet raised from the surface of the imprcssion-cylinder so as to insure the en trance of strippers or fly-fingers under the sheet preparatory to stripping the sheet tail first from the cylinder on its retrograde revoluiion.

The invention pertains to that class of printingpresses in which the impression-cylinder has anoseillating motion, or rotates in both directions, delivering the sheet tail first from the cylinder, said invention being an improvement on Letters Patent Nos. 257,578, 257,580, and 257,581, granted to me May 9, 1882, and on my invention for which application, Serial No. 124:,297, for patent for improvement in printing-presses was filed March 15, 1884.

The invention consists of the parts and c0mbination of parts as hereinafter described, and set forth in the claims.

In the accompanying drawings, Figure 1 is a side elevation in outline of an under-feed cylinder printingpress. Fig. 2 is a view in plan of the same machine.

In each of said figures only such parts of the machine are shown as are necessary to a clear illustration of the invention, it being understood that the cylinder oscillates or rotates in one direction to make the impression and in the opposite direction in delivering the sheet.

Fig. 3 is a segment of the impression-cylinder in section, with both stripper-fingers and fly-lingers in position shown on an enlarged scale. Figs. l and 5 are Side views ofa sheet lifting or supporting loop or strip on a still larger scale. Figs. 6 and 7 are views similar to Figs. and 3, showing an arrangementby which the lly'lingers serve to strip the sheet from the cylinder as well as to convey it over to and upon the fly'board, the separate stripperfingers shown in Figs. 2 and 3 being dispensed with.

In said figures the several parts are indicated by letters as follows:

A A are the main frames of the machine. B is the impression-cylinder; D, the feedboard; E, the fly-board or receiving-board.

F F are sheet-strip per fingers, supported on a rod, F, carried at its ends in the frames A.

G G are the fly-fingers, which may also be adapted to act as sheetstrippers-dispensing with the fingers F, as shown in Figs. 6 and 7- attached in the usual way to a rock-shaft, G. H is the blanket, and H the tympansheet, stretched by the reel-rods H H 1 is aportion of the printing-segment of the cylinder.

J J are a number of loops or strips of stiff paper or other suitable material pasted or glued or secured byanysuitable means to the tympan-sheet in a line parallel to the axis of the cylinder, and in such positions that the tail-margin of the sheet will rest upon them. The loops or strips J J are separated at points opposite the stripper-fingers E, Fig. 2, or opposite the liy-fingers G, Fig. 6, in which latter figure the fly-fingers G perform the office of sheet-strippers, as well as that of fly-fingers, the sheet-'stippers F being dispensed with. Said strippers may therefore, in. either case, be placed sufficiently close to the tympan to pass under the tail of the sheet without coming in contact with Said loops or strips. The fiy-fingers G in Figs. 2 and 3 are short enough to escape contact with the loops or Strips J J, and the stripper-fingers F are so placed and inclined upon the rod F as to lead the Sheet upon the fly-fingers G.

All actuating parts of the machine are omitted from the drawings as unnecessary for the full illustration of this invention, it being understood, however, that the cylinder-grippers take the sheet from the feed-board D at the bottom of the cylinder, that the cylinder makes a sufficient rotation in the printing direction to not only print the impression from the form, but also to allow the form to run under the inking-rollers B, and at the same time to bring the tail of the sheet above and beyond the points of the stripper-fingers F, as seen at J, Fig. 1, the cylinder then being slightly raised by suitable mechanism to clear the form on the retrograde or nonprinting stroke, and caused to rotate in the reverse ICO direction to the starting-point. During said reverse rotation the sheet is stripped from the cylinder tail first, the cylinder grippers being caused to open at the time they are passing the points of the stripper-fingers F, Figs. 2 and 3, or stripper fly-fingers G, Figs. 6 and 7, to release the head of the sheet, at which time in either case the fiyfiugers Gr are caused to oscillate over and deposit the sheet upon the fly-board E.

If the stripper-fingers or sheet-strippers F be dispensed with, the fly-fingers G are extended to nearly touch the tympan-sheet, as shown in Figs. 6 and 7, and are so spaced with reference to the sheet-supporting loops or strips J J as to pass through the openings between said loops or strips, and thus to act as Shectstrippers, stripping the sheet directly from the cylinder without the intervention of the sheet-strippers F.

Of course the fly-fingers G may be entirely dispensed with, if desired, any other or no other delivery apparatus being substituted therefor. S indicates the sheet, (shown in place in Figs. 1, 3, and 7,) with its tail-margin represented at J.

I do not confine myself to the specific form of loop shown at J in the several figures, as said loops or strips may be made of paper or other elastic material of any suitable thickness, and may be secured at one end only to the tympan and bent as shown at J, Fig. 5,

or shaped into various other forms. Theloops J or strips J may of course be secured on the tympan at any line parallel to the axis of the cylinder proper to lie just under and support the tail of any size of sheet that it may be desired'to' print. In practice it is found that stout Manila paper secured to the paper or muslin tympan-sheet with paste in the form and manner shown in Figs. 1 to 4 inclusive, answers every purpose. Said paper is cheap, quickly attaehed,ot' suflicient elasticity to sup port theshcet away from thetyinpan, and easily yields to any pressure upon it by the furniture, quoins, &c., just beyond the tail of the form while the loop or strip is passing over them on the impressionstroke. Said sheetsupports J J being placed so that they shall be under the extreme tail-margin of the sheet only, they cannot of course come in contact with the types or form, but travel over the furniture or qnoins only in the operation of printing.

I do not herein claim a receiving and delivery mechanism consisting of the feed-board D, the oscillating stripper fly-fingers G, and fly-board E, as I have reserved the combination of such elements with an impression-cylinder for another application for Letters Patent, the same having been filed February 11, 1885, bearing the serial number 155,581.

Having thus fully described my said improvement as of my invention, I claim 1. In a printing-press wherein the printed sheets are delivered tail first from an impression-cylinder, in combination with said cylinder, elastic sheet-supports, as J T, secured to the tympan or covering of said cylinder,whereby the tail-margins of the sheets are elevated from said covering without said supports passing over the types or form during the operation of printing, substantially as and for the purposes set forth.

2. In a printing-press wherein the printed sheets are delivered tail first from an impressioireylinder, in combination with said cylinder, a series of elastic sheet supports, as J J, secured to its covering, and a series of sheet strippers, whereby the tail-margins of the sheets are received upon said supports and said sheets stripped from said cylinder by said strippers without contact ofsaid supports and strippers, substantially as and for the purposes set forth.

3. In a printing-press wherein the printed sheets are delivered tail first from an i1npression-eylinder, in combination with said cylirr der, a series of elastic sheet-supports, as J J, secured to its covering, and a series of stripper-fingers, as F, whereby the tail-margins of the sheets are received upon said supports and said sheets stripped from said cylinder by said fingers without contact of said supports and fingers, substantially as and for the purposes set forth.

JOHN T. HAWVKINS.

\Vi tn esses:

JOHN F. MONTGOMERY, ELISHA T. JACKSON. 

